(19)

(11)

EP 0 904 647 A2

(12)

(43) Date of publication: 31.03.1999 Bulletin 1999/13 (21) Application number: 97926107.0 (22) Date of filing: 12.06.1997

(51) International Patent Classification (IPC):  G06F 13/ 00( . ) H04Q 11/ 04( . ) H04L 12/ 56( . ) (86) International application number: PCT/GB1997/001591 (87) International publication number: WO 1997/048214 (18.12.1997 Gazette 1998/02)

(84) Designated Contracting States: DE FR GB IT (30) Priority: 13.06.1996 GB 19960012363 (71) Applicant: BRITISH TELECOMMUNICATIONS public limited company London EC1A 7AJ (GB)	(72) Inventors: DAVISON, Robert, George Suffolk IP4 2RE (GB) AZMOODEH, Manoochehr Ipswich, Suffolk IP5 7YA (GB) HARDWICKE, James, John Suffolk IP3 9AH (GB) (74) Representative: Evershed, Michael, et al  BT Group Legal Services, Intellectual Property Department, 8th Floor, Holborn Centre, 120 Holborn London EC1N 2TE London EC1N 2TE (GB)